adidas Women's Adizero Boston Boost 5 Tsf W Women's Running Shoes 100% Textile/Synthetic Imported Rubber sole Weight: 190 g (size UK 5.5) boost's energy-returning properties keep every step charged with an endless supply of light, fast energy Coolever mesh upper and lining for heat management and enhanced performance; Tirrenina synthetic suede overlays for added support Extended TORSION SYSTEM for energy return in the forefoot and natural integrity in the midfoot Moulded responsive EVA sockliner for anatomical fit and great step-in comfort